CHRONO

11 s.

Ajouter ou retrancher un nombre du type 10, 200...

CHRONO

0 s.
258 + 100 =
254 - 30 =
413 + 30 =
876 - 100 =
261 + 500 =
283 - 50 =
74 + 60 =
735 + 100 =
159 - 20 =
175 + 600 =
54 + 50 =
347 + 40 =
74 - 20 =
113 + 30 =
375 + 30 =
633 + 100 =
402 + 20 =
190 + 10 =
349 - 20 =
264 + 300 =